Exporting models to Adobe Dimension
According to https://en.wikipedia.org/wiki/Wavefront_.obj_file :
"OBJ coordinates have no units[...]"

This means that it is up to the importing application to decide what a unit is. It could be yards, kilometres, centimetres etc. If you know that Adobe Dimension uses centimetres then you need to export it as such.

You can set the scale to 100 in the obj exporter for instance.

The obj file format can be opened with a text editor to review how the object is exported.